drm: Make dev_is_drm local to logind backend

This function is only used for logind, which is Linux-specific, but the
presence in common/drm.c suggested that it had to be portable.

Move it to the logind backend for now.

common/drm.c

@@ -2,15 +2,6 @@
 #include <sys/ioctl.h>
 #include <sys/types.h>
 
-#if defined(__linux__)
-#include <sys/sysmacros.h>
-#endif
-
-#if defined(__NetBSD__)
-#include <stdlib.h>
-#include <sys/stat.h>
-#endif
-
 #include "drm.h"
 
 // From libdrm
@@ -29,32 +20,18 @@ int drm_drop_master(int fd) {
 	return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
 }
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__NetBSD__)
 int path_is_drm(const char *path) {
 	static const char prefix[] = "/dev/dri/";
 	static const int prefixlen = STRLEN(prefix);
 	return strncmp(prefix, path, prefixlen) == 0;
 }
-
-int dev_is_drm(dev_t device) {
-	return major(device) == 226;
-}
 #elif defined(__FreeBSD__)
 int path_is_drm(const char *path) {
 	static const char prefix[] = "/dev/drm/";
 	static const int prefixlen = STRLEN(prefix);
 	return strncmp(prefix, path, prefixlen) == 0;
 }
-#elif defined(__NetBSD__)
-int path_is_drm(const char *path) {
-	static const char prefix[] = "/dev/dri/";
-	static const int prefixlen = STRLEN(prefix);
-	return strncmp(prefix, path, prefixlen) == 0;
-}
-
-int dev_is_drm(dev_t device) {
-	return major(device) == getdevmajor("drm", S_IFCHR);
-}
 #else
 #error Unsupported platform
 #endif

include/drm.h

@@ -5,9 +5,4 @@ int drm_set_master(int fd);
 int drm_drop_master(int fd);
 int path_is_drm(const char *path);
 
-#if defined(__linux__) || defined(__NetBSD__)
-#include <sys/types.h>
-int dev_is_drm(dev_t device);
-#endif
-
 #endif

libseat/backend/logind.c

@@ -28,6 +28,14 @@
 #include "libseat.h"
 #include "log.h"
 
+static int dev_major_is_drm(unsigned int dev_major) {
+	return dev_major == 226;
+}
+
+static int dev_is_drm(dev_t device) {
+	return dev_major_is_drm(major(device));
+}
+
 struct backend_logind {
 	struct libseat base;
 	const struct libseat_seat_listener *seat_listener;
@@ -387,7 +395,7 @@ static int pause_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_e
 		return 0;
 	}
 
-	if (dev_is_drm(makedev(major, minor)) && strcmp(type, "gone") != 0) {
+	if (dev_major_is_drm(major) && strcmp(type, "gone") != 0) {
 		log_debugf("DRM device paused: %s", type);
 		assert(session->has_drm > 0);
 		set_active(session, false);
@@ -419,7 +427,7 @@ static int resume_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_
 		return 0;
 	}
 
-	if (dev_is_drm(makedev(major, minor))) {
+	if (dev_major_is_drm(major)) {
 		log_debug("DRM device resumed");
 		assert(session->has_drm > 0);
 		set_active(session, true);